Mechanical assessment of ultrafine-grained nickel by microcompression experiment and finite element simulation
Mechanical assessment of ultrafine-grained nickel by microcompression experiment and finite element simulation
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DOI：
10.1557/jmr.2011.248
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发表时间：
2012-01
影响因子：
2.7
通讯作者：
R. Schwaiger;M. Weber;B. Moser;P. Gumbsch;O. Kraft
中科院分区：
文献类型：
--
作者：
R. Schwaiger;M. Weber;B. Moser;P. Gumbsch;O. Kraft
在过去的二十年里，纳米压痕一直是用于小尺寸力学测试的最通用的方法。但是，由于应变梯度较大，无法直接识别材料参数，如屈服和抗拉强度。这是一个重大缺陷，并导致了替代微尺度测试技术的发展，微压缩是当今最流行的测试技术之一。本研究采用超细晶镍的原位微压缩实验和有限元模拟相结合的方法，系统地研究了实际样品形态和实验条件不可避免的变化对实验结果的影响。这将证明，无论是定性分析，更不用说定量分析，都不像看起来那么简单，这削弱了微压缩测试的明显优势。
Over the past two decades, nanoindentation has been the most versatile method for mechanical testing at small length scales. Because of large strain gradients, it does not allow for a straightforward identification of material parameters such as yield and tensile strength, though. This represents a major drawback and has led to the development of alternative microscale testing techniques with microcompression as one of the most popular ones today. In this research, the influence of the realistic sample configuration and unavoidable variations in the experimental conditions is studied systematically by combing in-situ microcompression experiments on ultrafine-grained nickel and finite element simulations. It will be demonstrated that neither qualitative let alone quantitative analyses are as straightforward as they may appear, which diminishes the apparent advantages of microcompression testing.